When creosote isn't taken out, it could become a thick coating of particles inside the flue and chimney. Most chimney fires start during the smoke chamber/smoke shelf region so it’s imperative that you clean up All those areas. Basically sweep or vacuum the chilly ashes and dispose of them outside https://chimneyrepair60244.thechapblog.com/27693769/5-tips-about-fireplace-direct-you-can-use-today